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Method of extracting lignin from papermaking black liquor

A technology for papermaking black liquor and lignin, which is applied in the field of lignin extraction, can solve the problems of secondary pollution, low purity of separated lignin, etc., and achieves the effect of improving the utilization rate

Inactive Publication Date: 2017-12-29
ANHUI AGRICULTURAL UNIVERSITY
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Problems solved by technology

However, the main disadvantage of this method is that the purity of the separated lignin is low, and it is easy to cause secondary pollution.

Method used

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  • Method of extracting lignin from papermaking black liquor

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Embodiment 1

[0021] The invention provides a method for extracting lignin from papermaking black liquor. Firstly, ethanol is used to remove some polysaccharide substances in the black liquor, and then the lignin is extracted with acid, so that the purity of lignin obtained will be higher. The preparation method includes the following steps: step:

[0022] Step 1. Take papermaking black liquor and absolute ethanol at a volume ratio of 1:1 and place them in a reaction kettle, shake and mix evenly to obtain a mixed liquor, and treat the mixed liquor in a water bath at 60°C for 2 hours; Purity is not high, based on this, ethanol is added in the papermaking black liquor, to separate out the polysaccharide insoluble in ethanol in the papermaking black liquor, thereby obtain comparatively pure papermaking black liquor and go to step 2;

[0023] Step 2. Pour the mixed solution after the water bath treatment into the separatory funnel, shake it for 10 minutes, and then separate into layers, and col...

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Abstract

The invention relates to a method for extracting lignin from papermaking black liquor, which includes seven steps to obtain lignin. The yield of lignin obtained in the invention can reach 95%, and the purity of lignin obtained can also reach 98%. , carry out the structure characterization to the obtained lignin, its theoretical molecular formula is respectively C10H10.68O3.54N0.02, it can be seen that the lignin contains guaiacyl and syringyl structural units, and the linkage types are β‑O‑4, β-1, β-5, and β-β contain active groups such as more free carbonyl groups, methoxyl groups and hydroxyl groups, and all show the characteristics of typical broad-leaved wood lignin. It can be seen that the obtained lignin of the present invention is a papermaking This method greatly improves the utilization rate of papermaking black liquor, and plays a positive role in today's advocacy of turning waste into treasure.

Description

technical field [0001] The invention relates to a method for extracting lignin from papermaking black liquor, and belongs to the field of papermaking black liquor reprocessing. Background technique [0002] Papermaking black liquor is the residue in the process of pulping and papermaking. Because of its black color, it is called black liquor. It is the most polluted among the three major papermaking wastewaters (black liquor, white water, and middle water), accounting for the entire papermaking waste liquor. 90% of pollution. The main components of black liquor are lignin, hemicellulose and some degraded sugars. Today, when advocating "turning waste into treasure", how to reuse black liquor has become a key research issue. At present, the most direct utilization of black liquor at home and abroad is alkali recovery, reclaiming the alkali in it for secondary reuse, and utilizing the heat energy generated by burning it. Other scholars have also conducted research on other u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08H7/00
CPCC08H6/00
Inventor 王传贵李媛媛方徐勤武恒董宏敢
Owner ANHUI AGRICULTURAL UNIVERSITY
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